Hashtags sometimes are used for indexing. In this instance it was the the only hashtag used and it was at the end of an understandable congratulations Tweet re Higgins win.
The hashtag was used to make a political point and it is an irresponsible one IMO, feeding hysterical views in vulnerable people (as my two friends demonstrated - yet Reddit don't think anyone would interpret the hashtag thus).
There was the other two points I mentioned as well, all within a year.